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Commit 83814237 authored by Swathi Sridhar's avatar Swathi Sridhar
Browse files

documentation/ion: Add description for secure carveout heap 



Add documentation for the secure carveout heap which helps
manage secure memory that is not accessible by the HLOS.

Change-Id: I549d4a434f839f5005750cc2fcd435f00f8eb370
Signed-off-by: default avatarSwathi Sridhar <swatsrid@codeaurora.org>
parent fa101d02

Documentation/devicetree/bindings/arm/msm/msm_ion.txt

+30 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ Required properties for Ion heaps 
  the following:

    - "SYSTEM"

    - "CARVEOUT"

    - "SECURE_CARVEOUT"

    - "DMA"

    - "HYP_CMA"

    - "SYSTEM_SECURE"
@@ -57,3 +58,32 @@ Example: 
                 };



        };



"SECURE_CARVEOUT"



This heap type is expected to contain multiple child nodes. Each child node

shall contain the following required properties:



- memory-region:

Refer to Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt



- token:

A u32 containing the set of secure domains which will be able to access the

memory-region.



Example:

qcom,ion {

	compatible = "qcom,msm-ion";

	#address-cells = <1>;

	#size-cells = <0>;



	qcom,ion-heap@14 {

		reg = <14>;

		qcom,ion-heap-type = "SECURE_CARVEOUT";



		node1 {

			memory-region = <&cp_region>;

			token = <ION_FLAG_CP_TOUCH>;

		};

	};

};